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26 NTU Optical Network Terminals
3.2 NTU-2W Architecture
Fig. 15— Logical Architecture of a Device with Factory Settings
Main Components of the Device:
– optical receiver/transmitter (SFF module) for conversion of an optical signal into an electric one;
– processor (PON chip) which converts Ethernet and GPON interfaces.
A device with factory (initial) settings have the following logical blocks (see Fig.15Fig. 15):
br1;
eth0…1;
wl0;
IPInterface.
In this case, the br1 block is used to combine LAN ports in one group.
The eth0..1 blocks physically represent Ethernet ports with RJ-45 connector for connection of PC, STB, or
other network devices. They are logically included into the br1 block.
The wl0 block is an interface for Wi-Fi module connection.
The Filter and Marking blocks are designed to include local interfaces in one group (br1). These blocks are
responsible for traffic rules: Filter is used for incoming traffic, while Marking—for the outgoing one.
The IPInterface block is a logical object with an IP address for LAN access and a DHCP server, which
assigns addresses to clients.
A connection to the OB device (successful connection to a stationary OLT) additionally creates the
gpondef blocks with the help of the OMCI protocol (ONT Management and Control Interface). The block ensures
connection of the subscriber’s ONT device to station-side equipment.
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